In my opinion, your use case (Defining Shared Folder Access Volume) is not comparable. My use case assumes that SMB shares are mounted as external drives in NC and that these shares are simultaneously used by Paperless as data directories.
If both NC and Paperless use the same group and user permissions in AD, SAMBA should manage the data in the correct permission context.
What I cannot judge is how NC manages the data in its database when it enters through the side door, so to speak.
However, what do I know…